MAZATLAN UNIVALVES 255 
Tablet 1179 contains 2 rubbed opercula, which may have 
been washed up from young Callopoma saxosum. 
Tablet 1180 contains a shelly operculum (apex broken) which 
must have had about 10 whirls in a diameter of °45; outside 
nearly smooth, convex ; inside very concave, with the margins 
of the whirls projecting, and beautifully crenated. 
Hab.—Mazatlan ; from shell washings ; L’pool Col. 
Famity NERITIDA. 
Genus NERITA, Linn. 
Odontostoma, Klein, non D’ Orb., nee Phil. 
326. NERITA SCABRICOSTA, Lam. 
An. s. Vert. vol. viii. p. 608, no. 14.— Réel. in Petit Journ. 
Conch. vol. i. pp. 287, 410, pl. 11, f£ 2.—C. B. Ad. Pan. Shells, 
p- 204, no. 304.—(Non Deless. in Rec.) ¢ 
=N. fornata, Sow. Gren. pl. 4, f. 4.— Wood, Ind. Test. Suppl. 
pl. 8, f. 4.—Rve. Conch. Syst. pl. 202, f. 4.—Phil. Abbild. 
p.1, pl.1, f. 2,3.—Mke. in Zeit. f. Mal. 1850, p. 167, no. 21.— 
Rve. Conch. Ic. pl. 1, f. 3, a, b. 
+N. Deshayesu, Récl. in Rev. Zool. 1841, p. 184.—Rve. Conch. 
Hes pls 2, %. 75 a5: 
+N. multijugis, MWke. in Zeit. f. Mal. 1847, p.179, no. 7, 
(teste Mke. ipso, ie cit. 1850,)— Rve. Hlem. Conch. pl. 16, 
f. 86. 
= Pila multijugis + P. ornata + P. scabricosta, H. & A. Ad.: 
Gen. 1. 379, 380. 
The N. ornata of Sow. is referred to the N. scabricosta of 
Lam. on the undoubting authority of Prof. Adams. The 
original description (from a supposed unique specimen,) might 
fit many species ; and Desh. (who was debarred by Kien. from 
inspecting the Lamarckian types, even when editing the Az. s. 
Vert.) does not venture on synonyms. The N. multijugis of 
Menke, described from adolescent specimens, was abandoned 
by himself, and yet appears in modern w oe as distinct. The 
form N. Deshaysii, (to which most of the Mazatlan specimens 
belong) 1s separated in consequence of having more numerous 
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